John north



staat (iiiliw.

JOHN NORTH, OF NEW YORK, N.

Y., ASSIGNOR TO HIMSELF AND WILLIAM T. HoL'r, oF SAME PLACE.

Letters .Pci-ent No. 91,765, dated func 22, 1869.

IMPROVED ROCK-DRILLING- APPARATUS The Schedule referred to in thseLetters Patent and making part of the same.

To all 'whom it may concerni- Be it known that I, JOHN NORTH, of thecity,

`county, and State .of New York, have invented a new and useful Machinefor Drilling in Rock and in the f Earth; and l do hereby declare thatthe following is a full, clear, and exact description of theconstruct-ion and operation of the same. reference heilig had to theannexed drawings, making a part of this specitication, iu which- IFigure 1 is a vertical perspective view-of said machine; l

Figure 2 is a plan of the same;

Figure 3 is a horizontal section thereof;

Figure 4 is a detached View of the adjust-able frictional feed-gears.

`The chief `aim or purpose of my invention is to furnish suitablemachinery for successfully operating a centain diamond-pointedrock-drill, patented by Itudolphe Leschot, in 1863, but it may be usedas' well for operating any kind of rotating drill or tool for boring inrocksI or in the earth.

My invention consists in a combination of mechanical devices for therotating, feeding, controlling, and adjusting of the drill, so that thesame may be couvenieutly operated without loss of power or time, andmade to drill in an'y direction without changing the position of themachine.

To enable others skilled in the art to make and use my invention, I willproceed to describe its construction and operation, with reference tothe drawings.

In constructing my drilling-machine, I make the upright shafts A A, l,fastenedY together at each end by the cross-bars c c, havingextension-screws, B B BB, which are used to set the machine firmlyagainst the sides of the drift or tunnel in which it is operated.

'lo this upright frame, I attach a movable drillframe, D, which slidesupon the same, and -is held fast at any desired point by the clamp H andnut g, iig. 2, which is 4screwed against the clamp H.

Inside of this drill-frame I), l secure the circular disk of thedrill-head E, figs. l and 3, by means of the hollow shaft J, which isconnected therewith, and forms a part of `the same.

This hollow shaft passes through the respective centres of the frame D,clampH, and nut g, and is held fast by the nut l, iig. 3.

The outer periphery of the circulai' plate of this drill-head E isslightly bevelled, to tit the adjustable frame l), causing a frictionwhen the nut K is screwed fight.

The drill-head is thus held fast at any desired point, with its attacheddrill-rod inclined to any angle required for drilling, and the drill ispointed in any direction, to suit the operator, by releasing the uut'K,which secures the drill-head, as described.

. The drill-head E is supplied with two boxes, attached to the same, forthe support of the? n'ut and sleevegear, through which the'screw-s'haf'tIt wor' Y ,The feed-shafts is-snpported on the opposit jsi parallel tothe screw-shaft lt, audis held securebythe saine'caps, V Y, which holdthe 4sleeve-gears and screwshaft. i y

'lhe crank l? is fastened tothe pinion O, and re'- volves on a stud madefast to the adjustable arm W.

The pinion O gears into gear N,which is screwedl fast to thc shaft VL,passing through the hollow shaft' of the drill-head. y

This shaft L, which is thedriving-shaft,has a bevelgear attached to itsfront end, gearing into the lower teeth of the sleeve-gear, which isfeathered into the slot of the screw-shaft, as shown in `fig. 1, wherebya rotary motion is impartedto the screw-shaft and drili.l

By releasing the nut K, the position ofthe crank P and pinion O may bechanged to suit the operator, and worked either at top of gear 'N asshown, fig. 1, or at bottom of same.

The drillu'od or tube 3, of any desirable length, passes through thehollow screw-shaft R, and is held fast to the same at any desired pointby means of the' setfscrews and chock, 2 2.

This drill-rod has a thread cult on its lower end, ofa pitch opposite tothat of the thread upon the screwshaft, Vto which the boring-head orbit, with diamond teethgfis screwed-iast.

rlhe gear Y, whichis the upper portion of the sleeve gear, figs. 1 and2,-gea1ing into gear X, gives motionl to the feedfshaft S, whichrevolves in au opposite direction to the screw-shaft.

At the lower end of the feed-shaft 8 is attached the feed-gear A, whichgears into gear B2, made fastto the screwnut- 5.

Feed-gear N has one or more teeth more than gear B, causing the nut torun faster than the screw, and giving a positive feeding or forwardmotion to the screwshaft and drill, called a differential feed.

In my experience in drilling stone'with diamonds, I have found that inorder to drill hard and soft stone with the saine machine, aseltladjusting feed is desira- Able, as the diamonds are otherwiseliable to be loosened in their settings, by drilling through soft rockliuto hard rock at a high rate of speed. I therefore use aself-adjnsting feed, in combination with the diff ferential feed abovedescribed.

Imake the feed-geai-A a frictional one, (see iig. 4,) and therebyproduce a combined differential aud frictional feed.

The iced-shaft S is made tapering at its lower end, A, fig.4, and-tbefeed-gear A2 is made to fit the same, and backed by a washer 0I' collar,B, and is held in position and adjusted bythe nut 2.

The feed-gear vbeing adjusted sufficiently tight to drive the screw-nutwhen drilling soft roel-:,011 coming to hard rock, the fri/tional gearwill slip, and thus the pressure; when the drill-bit will he adjusted ata uniform rate.

All danger of injuring or loosening the diamonds, by changes inthehardness of the rock, is thus. obviated.

The gear X, attached tothe upper end of the feedshaft 8, is so arrangedas to be slipped out of gear when the screw has run down to any desireddepth,

-causi'ng the screw to run up its length by the same motion of theengine or cra-nk, and driving-shaft L,

Awhich carried it down, but with a; velocity far greater.

When the gear X is slipped back'iu place, the screw feeds down again, asbefore. This gear is-easily adj ustable on the feed-shaft 8, to whichitis fastened-by the motion ofthe finger.

Tlev'sliding steady-guide tis adjustable toauy posi- `tion, andis'usedto steady the drill-rod or boring-bar,

as lthe 4sgnnefpasse's into the rook, in order to prevent any shakeortreiuor of the same in boring. l

^ 'lain'aware that other machines have been invented for operatingdrills of various kinds, and I hereby expies'slQy-'lxlisolaim allprevious inventions of like 'nature with luy-own, particularly that ofA. Haupt. of May 2, 18655. but

What `I claim as my invent-ion, and desire to secure by Letters Patent,is- 4 l. The drill-frame D, adjustable at any point upon the uprightframe A A, by means of the nut g, when said frame is used in combinationwith the swivel-head E, substantially as and for the purposes set forth.

2. The swivel drill-head E, support-ing a sleeve-gear and drill-rod,when used in combination wit-h a drillframe, lwhether adjustable orotherwise, and secured thereto by the hollow shaft I and the nut K,substantially as and for the purposes set forth.

3. The hollow screw-shaft It, when used'iu combination with the swiveldrill-head, sleeve-gear, and feednut, or their quivalents, substantiallyas and for the purposes described.

4. The release-gear X, when used in combination with the driving andsleeve-gear, substantially as and for the purposes described. l

5. The adjustable steady-guide, when used in eombination with thedrill-head, screw-shaft, and boringbar, substantially as and for thepurposes speoified.

6. The straight and continuous driving-shaftL, passing through thecrank-arm V, clamp H, hollow shaft J, nuts g and K, and driil-head E,substantially as and for the purposes specified.

. JOHN NORTH.

Witnesses L. WEAVER, WILLIAM GIRQD.

